单项选择题

A．The lifecycle of trees.
B．The number of trees.
C．The intensity of solar burning.
D．The quality of air.
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单项选择题
The passage mainly discusses ________.
A．a new way of highway speed control
B．a new pattern for painting highways
C．a new approach to training drivers
D．a new type of optical illusion
单项选择题
A．To tie her shoes.B．Through the gate.C．To the lake.D．Under the hedge.
A．To tie her shoes.
B．Through the gate.
C．To the lake.
D．Under the hedge.
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